<?php


namespace app\common\aliyun;


use think\facade\Config;

class oss
{

    //阿里云搞不清楚干啥的，别删就行了，getOssAuth函数需要用
   public static  function gmt_iso8601($time) {
        $dtStr = date("c", $time);

        $mydatetime = new  \DateTime($dtStr);

       $expiration = $mydatetime->format(\DateTime::ISO8601);
       $pos = strpos($expiration, '+');
       $expiration = substr($expiration, 0, $pos);
        return $expiration."Z";
    }


    public static function  callback(){
        // 1.获取OSS的签名header和公钥url header
        $authorizationBase64 = "";
        $pubKeyUrlBase64 = "";
        /*
         * 注意：如果要使用HTTP_AUTHORIZATION头，你需要先在apache或者nginx中设置rewrite，以apache为例，修改
         * 配置文件/etc/httpd/conf/httpd.conf(以你的apache安装路径为准)，在DirectoryIndex index.php这行下面增加以下两行
            RewriteEngine On
            RewriteRule .* - [env=HTTP_AUTHORIZATION:%{HTTP:Authorization},last]
         * */
        if (isset($_SERVER['HTTP_AUTHORIZATION']))
        {
            $authorizationBase64 = $_SERVER['HTTP_AUTHORIZATION'];
        }
        if (isset($_SERVER['HTTP_X_OSS_PUB_KEY_URL']))
        {
            $pubKeyUrlBase64 = $_SERVER['HTTP_X_OSS_PUB_KEY_URL'];
        }

        if ($authorizationBase64 == '' || $pubKeyUrlBase64 == '')
        {
            header("http/1.1 403 Forbidden");
            exit();
        }

// 2.获取OSS的签名
        $authorization = base64_decode($authorizationBase64);

// 3.获取公钥
        $pubKeyUrl = base64_decode($pubKeyUrlBase64);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $pubKeyUrl);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
        $pubKey = curl_exec($ch);
        if ($pubKey == "")
        {
            //header("http/1.1 403 Forbidden");
            exit();
        }

// 4.获取回调body
        $body = file_get_contents('php://input');

// 5.拼接待签名字符串
        $authStr = '';
        $path = $_SERVER['REQUEST_URI'];
        $pos = strpos($path, '?');
        if ($pos === false)
        {
            $authStr = urldecode($path)."\n".$body;
        }
        else
        {
            $authStr = urldecode(substr($path, 0, $pos)).substr($path, $pos, strlen($path) - $pos)."\n".$body;
        }

        // 6.验证签名
        $ok = openssl_verify($authStr, $authorization, $pubKey, OPENSSL_ALGO_MD5);
        if ($ok == 1)
        {
            header("Content-Type: application/json");
            $data = array("Status"=>"Ok");
            $arr=[];
            parse_str($body,$arr);
            $data['body']=$body;
            $data['name']=$arr['filename'];
//            $data['body']=$body;
            return $data;
//            echo json_encode($data);
        }
        else
        {
            return false;
        }
    }


//获取阿里云上传文件的授权
    public static function getOssAuth($callbackUrl  ,$dir ){


        $id= Config::get('oss.AccessKeyId');          // 请填写您的 AccessKeyId。
        $key= Config::get('oss.AccessKeySecret');      // 请填写您的 AccessKeySecret。
        // $host的格式为 bucketname.endpoint，请替换为您的真实信息。hello-school-test.oss-cn-beijing.aliyuncs.com
//        $host = 'http://lanchong.oss-cn-beijing.aliyuncs.com';
        $host =Config::get('oss.host');  ;
        // $callbackUrl为上传回调服务器的URL，请将下面的IP和Port配置为您自己的真实URL信息。
//        $callbackUrl = 'http://api.hello-school.cn/oss-test/phlanchong.oss.94mmp.cnp/callback.php';
//        $dir = 'shop/';          // 用户上传文件时指定的前缀。

        $callback_param = array('callbackUrl'=>$callbackUrl,
            'callbackBody'=>'filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}',
            'callbackBodyType'=>"application/x-www-form-urlencoded");
        $callback_string = json_encode($callback_param);

        $base64_callback_body = base64_encode($callback_string);
        $now = time();
        $expire = 60;  //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问。
        $end = $now + $expire;
        $expiration =self::gmt_iso8601($end)  ;


        //最大文件大小.用户可以自己设置
        $condition = array(0=>'content-length-range', 1=>0, 2=>1048576000);
        $conditions[] = $condition;

        // 表示用户上传的数据，必须是以$dir开始，不然上传会失败，这一步不是必须项，只是为了安全起见，防止用户通过policy上传到别人的目录。
        $start = array(0=>'starts-with', 1=>'$key', 2=>$dir);
        $conditions[] = $start;


        $arr = array('expiration'=>$expiration,'conditions'=>$conditions);
        $policy = json_encode($arr);
        $base64_policy = base64_encode($policy);
        $string_to_sign = $base64_policy;
        $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));

        $response = array();
        $response['accessid'] = $id;
        $response['host'] = $host;
        $response['policy'] = $base64_policy;
        $response['signature'] = $signature;
        $response['expire'] = $end;
        $response['callback'] = $base64_callback_body;
        $response['dir'] = $dir;                        // 这个参数是设置用户上传文件时指定的前缀。
//        echo json_encode($response);
        return $response;
    }



}
